ELBOW 4U7974 - Caterpillar

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat products.Dispose of all fluids according to local regulations and mandates.
Specifications
Table 1
Steering Relief Valve    
Pressure Setting    
18825 345 kPa (2730 50 psi)    
One turn of adjusting screw    
12000 kPa (1740 psi)    Introduction
The following procedure is used to measure and adjust the steering system relief valve pressure setting.Required Tools
Table 2
Required Tools    
Tool    Item    Qty    Part No    Description    
B     B1     1     8T-0859     Pressure Gauge
0 to 25000 kPa (0 to 3600 psi)    
B2 1     6V-3989     Fitting    
B3 2     6V-4143     Quick Connect Coupler    
B4 1     177-7861     Hose As
4.3 m (14 ft)    
Illustration 1 g03014916
(B) ToolingTest Preparation
Move the machine to a hard level surface away from operating machines and away from personnel.
Engage the parking brake. Place wheel blocks in front of the wheels and behind the wheels.
Stop the engine.
Illustration 2 g03077276
Steering frame lock installed
Install the steering frame lock. ReferenceRefer to Operation and Maintenance Manual, "Steering Frame Lock" for the machine being serviced.Note: The machine will be turned against the steering frame lock in order to open the steering relief valve.
Start the engine and warm up the hydraulic oil.Note: The hydraulic oil must be at normal operating temperature in order to obtain an accurate reading.
Stop the engine.
Release the pressure from the steering system. Refer to Systems Operation, Testing & Adjusting, "System Pressure - Release".Test Procedure
Illustration 3 g03068736
Steering control valve (1) Location of the pressure tap for the steering system
Remove the dust cap and connect Tooling (B) to pressure tap (1) .
Start the engine. Operate the engine at the high idle rpm with the transmission in neutral.
Turn the machine against the steering frame lock in both directions. The steering relief valve will open.
Record the pressure on the pressure gauge. Refer to Table 1 for the correct pressure setting.
Stop the engine.
Release the pressure from the steering system. Refer to Systems Operation, Testing & Adjusting, "System Pressure - Release".
If the pressure setting is incorrect, refer to "Adjustment Procedure".
If the pressure setting is correct, remove Tooling (B) and install the dust cap.
If the pressure setting is correct, remove the steering frame lock. ReferenceRefer to Operation and Maintenance Manual, "Steering Frame Lock" for the machine being serviced.Adjustment Procedure
Illustration 4 g03068756
Steering control valve (2) Pressure adjusting screw
Remove plug (2) in order to access the steering system pressure adjusting screw.
Turn adjusting screw clockwise in order to increase the pressure setting. Turn adjusting screw counterclockwise in order to decrease the pressure setting.
When the correct pressure setting is obtained, stop the engine. Remove the pressure gauge from the pressure tap. Place the protective cover on the